package system

import (
  "errors"
  uuid "github.com/satori/go.uuid"
  "gorm.io/gorm"
  "livefind/common/request"
  "livefind/global"
  "livefind/model/system"
  "livefind/utils"
)

//@author: [piexlmax](https://github.com/piexlmax)
//@function: Register
//@description: 用户注册
//@param: u model.SysUser
//@return: err error, userInter model.SysUser

type UserService struct {
}

func (userService *UserService) Register(u system.SysUser) (err error, userInter system.SysUser) {
  var user system.SysUser
  if !errors.Is(global.GVA_DB.Where("username = ?", u.Username).First(&user).Error, gorm.ErrRecordNotFound) { // 判断用户名是否注册
    return errors.New("用户名已注册"), userInter
  }
  // 否则 附加uuid 密码md5简单加密 注册
  u.Password = utils.MD5V([]byte(u.Password))
  u.UUID = uuid.NewV4()
  err = global.GVA_DB.Create(&u).Error
  return err, u
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: Login
//@description: 用户登录
//@param: u *model.SysUser
//@return: err error, userInter *model.SysUser

func (userService *UserService) Login(u *system.SysUser) (err error, userInter *system.SysUser) {
  var user system.SysUser
  u.Password = utils.MD5V([]byte(u.Password))
  err = global.GVA_DB.Where("username = ? AND password = ?", u.Username, u.Password).Preload("Authorities").Preload("Authority").First(&user).Error
  return err, &user
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: ChangePassword
//@description: 修改用户密码
//@param: u *model.SysUser, newPassword string
//@return: err error, userInter *model.SysUser

func (userService *UserService) ChangePassword(u *system.SysUser, newPassword string) (err error, userInter *system.SysUser) {
  var user system.SysUser
  u.Password = utils.MD5V([]byte(u.Password))
  err = global.GVA_DB.Where("username = ? AND password = ?", u.Username, u.Password).First(&user).Update("password", utils.MD5V([]byte(newPassword))).Error
  return err, u
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: GetUserInfoList
//@description: 分页获取数据
//@param: info request.PageInfo
//@return: err error, list interface{}, total int64

func (userService *UserService) GetUserInfoList(info request.PageInfo) (err error, list interface{}, total int64) {
  limit := info.PageSize
  offset := info.PageSize * (info.Page - 1)
  db := global.GVA_DB.Model(&system.SysUser{})
  var userList []system.SysUser
  err = db.Count(&total).Error
  err = db.Limit(limit).Offset(offset).Preload("Authorities").Preload("Authority").Find(&userList).Error
  return err, userList, total
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: SetUserAuthority
//@description: 设置一个用户的权限
//@param: uuid uuid.UUID, authorityId string
//@return: err error

func (userService *UserService) SetUserAuthority(id uint, uuid uuid.UUID, authorityId string) (err error) {
  assignErr := global.GVA_DB.Where("sys_user_id = ? AND sys_authority_authority_id = ?", id, authorityId).First(&system.SysUseAuthority{}).Error
  if errors.Is(assignErr, gorm.ErrRecordNotFound) {
    return errors.New("该用户无此角色")
  }
  err = global.GVA_DB.Where("uuid = ?", uuid).First(&system.SysUser{}).Update("authority_id", authorityId).Error
  return err
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: SetUserAuthorities
//@description: 设置一个用户的权限
//@param: id uint, authorityIds []string
//@return: err error

func (userService *UserService) SetUserAuthorities(id uint, authorityIds []string) (err error) {
  return global.GVA_DB.Transaction(func(tx *gorm.DB) error {
    TxErr := tx.Delete(&[]system.SysUseAuthority{}, "sys_user_id = ?", id).Error
    if TxErr != nil {
      return TxErr
    }
    useAuthority := []system.SysUseAuthority{}
    for _, v := range authorityIds {
      useAuthority = append(useAuthority, system.SysUseAuthority{
        id, v,
      })
    }
    TxErr = tx.Create(&useAuthority).Error
    if TxErr != nil {
      return TxErr
    }
    // 返回 nil 提交事务
    return nil
  })
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: DeleteUser
//@description: 删除用户
//@param: id float64
//@return: err error

func (userService *UserService) DeleteUser(id float64) (err error) {
  var user system.SysUser
  err = global.GVA_DB.Where("id = ?", id).Delete(&user).Error
  err = global.GVA_DB.Delete(&[]system.SysUseAuthority{}, "sys_user_id = ?", id).Error
  return err
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: SetUserInfo
//@description: 设置用户信息
//@param: reqUser model.SysUser
//@return: err error, user model.SysUser

func (userService *UserService) SetUserInfo(reqUser system.SysUser) (err error, user system.SysUser) {
  err = global.GVA_DB.Updates(&reqUser).Error
  return err, reqUser
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: GetUserInfo
//@description: 获取用户信息
//@param: uuid uuid.UUID
//@return: err error, user system.SysUser

func (userService *UserService) GetUserInfo(uuid uuid.UUID) (err error, user system.SysUser) {
  var reqUser system.SysUser
  err = global.GVA_DB.Preload("Authorities").Preload("Authority").First(&reqUser, "uuid = ?", uuid).Error
  return err, reqUser
}

//@author: [SliverHorn](https://github.com/SliverHorn)
//@function: FindUserById
//@description: 通过id获取用户信息
//@param: id int
//@return: err error, user *model.SysUser

func (userService *UserService) FindUserById(id int) (err error, user *system.SysUser) {
  var u system.SysUser
  err = global.GVA_DB.Where("`id` = ?", id).First(&u).Error
  return err, &u
}

//@author: [SliverHorn](https://github.com/SliverHorn)
//@function: FindUserByUuid
//@description: 通过uuid获取用户信息
//@param: uuid string
//@return: err error, user *model.SysUser

func (userService *UserService) FindUserByUuid(uuid string) (err error, user *system.SysUser) {
  var u system.SysUser
  if err = global.GVA_DB.Where("`uuid` = ?", uuid).First(&u).Error; err != nil {
    return errors.New("用户不存在"), &u
  }
  return nil, &u
}
